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A151819 First component x of pairs (x,y) where x!+y! is a square, sorted on x. 1
0, 0, 0, 1, 1, 1, 2, 4, 4, 4 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,7

COMMENTS

Conjecture: the only solutions for x!+y!=n^2 are x=0,0,0,1,1,1,2,4,4,4 and y=4,5,7,4,5,7,2,0,1,5 respectively.

LINKS

Table of n, a(n) for n=1..10.

CROSSREFS

Added as a companion to A082871.

Sequence in context: A131118 A140765 A097541 * A079560 A330601 A088680

Adjacent sequences:  A151816 A151817 A151818 * A151820 A151821 A151822

KEYWORD

nonn

AUTHOR

Farideh Firoozbakht, Jul 07 2009

STATUS

approved

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Last modified July 11 19:52 EDT 2020. Contains 335652 sequences. (Running on oeis4.)